I have heard the 1125 with a stock pipe and the D&D and it is not even a comparison. The D&D sounds incredible like nothing I have heard. I would even think about buying a 1125 now after heard it with a good pipe. Monster attitude and it sounds as good as it looks.
The polish/chrome looks out of place on the 1125R especially with the transition from the stock pipes to shiny pipes. If it were ceramic coated black it might look better.
The D&D pipe needs a tad bit of homework yet. Can't say anything about power but it drags in hard right turns. In racing that's a big deal. I'd imagine that could be a biggie in some off-track situations - however, I doubt that it'd be a biggie for most "Starbucks Racing" or straight-line stuff.